Short answer: the JBL 4645C for the higher ranking, the Chase Home Theater SS18.1 for the lower price. The JBL 4645C ranks #5 of 7 subwoofers at $4999. The Chase Home Theater SS18.1 ranks #6 at $2499, $2500 cheaper.
What the Chase Home Theater SS18.1 gets right: 18-inch sealed driver delivers 125.2dB CEA-2010-A average from a dedicated cinema-style sealed cabinet. The catch: Passive design needs external amplification, 41 kg weight, and sealed design room modes.
One note: the Chase Home Theater SS18.1 is discontinued, but it still ranks #6 of 7 subwoofers, ahead of most of what is still sold new, so it is worth considering used.
Buy the Chase Home Theater SS18.1 if the price matters more than the ranking. Buy the JBL 4645C if the ranking matters more than the price.
Specifications Side By Side
| Chase Home Theater SS18.1 | JBL 4645C | |
|---|---|---|
| Price | $2499 Discontinued | $4999 |
| Ranked | #6 of 7 in Large Passive Home Subwoofers (Over 75 lbs) | #5 of 7 in Large Passive Home Subwoofers (Over 75 lbs) |
| Enclosure | sealed | ported, front |
| Passive | Yes | Yes |
| Output SPL at 12.5 Hz | 92.8 dB | - |
| Output SPL at 15 Hz | 97.2 dB | - |
| Output SPL at 20 Hz | 101.3 dB | 98.9 dB |
| Output SPL at 25 Hz | 106.0 dB | 114.0 dB |
| Output SPL at 31.5 Hz | 111.6 dB | 118.7 dB |
| Output SPL at 40 Hz | 118.2 dB | 122.0 dB |
| Output SPL at 50 Hz | 123.6 dB | 123.7 dB |
| Output SPL at 63 Hz | 128.1 dB | 129.7 dB |
| Output SPL at 80 Hz | 130.8 dB | 133.9 dB |
| Output SPL at 100 Hz | 132.6 dB | 135.1 dB |
| Output SPL at 125 Hz | 133.7 dB | 135.8 dB |
| CEA-2010-A Average (40-80Hz) | 125.2 dB | 127.3 dB |
| Dimensions | 22.0"H x 24.0"W x 22.0"D (558.8 x 609.6 x 558.8 mm) | 39.75"H x 26.5"W x 17.75"D (1009.6 x 673.1 x 450.8 mm) |
| Measurement Source | Data-bass | Data-bass |
| Discontinued | Yes | - |
| Weight | 89.9 lbs / 40.8 kg | 138 lbs / 62.6 kg |
| Drivers | 18" (457mm) driver | 18" (457mm) driver |
| Warranty | - | 5/3/2 |
| Cabinet Color | - | black |
| Country | - | United States |
The Two Speakers In Full
Chase Home Theater SS18.1: $2499 Discontinued
Pros: 18-inch sealed driver delivers 125.2dB CEA-2010-A average from a dedicated cinema-style sealed cabinet.
Cons: Passive design needs external amplification, 41 kg weight, and sealed design room modes. Discontinued.
| CEA-2010-A Average (40-80Hz) | 125.2 dB |
|---|---|
| Dimensions | 22.0"H x 24.0"W x 22.0"D (558.8 x 609.6 x 558.8 mm) |
| Discontinued | Yes |
| Drivers | 18" (457mm) driver |
| Enclosure | sealed |
| Measurement Source | Data-bass |
| Output SPL at 12.5 Hz | 92.8 dB |
| Output SPL at 15 Hz | 97.2 dB |
| Output SPL at 20 Hz | 101.3 dB |
| Output SPL at 25 Hz | 106.0 dB |
| Output SPL at 31.5 Hz | 111.6 dB |
| Output SPL at 40 Hz | 118.2 dB |
| Output SPL at 50 Hz | 123.6 dB |
| Output SPL at 63 Hz | 128.1 dB |
| Output SPL at 80 Hz | 130.8 dB |
| Output SPL at 100 Hz | 132.6 dB |
| Output SPL at 125 Hz | 133.7 dB |
| Passive | Yes |
| Weight | 89.9 lbs / 40.8 kg |
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JBL 4645C: $4999
| CEA-2010-A Average (40-80Hz) | 127.3 dB |
|---|---|
| Cabinet Color | black |
| Country | United States |
| Dimensions | 39.75"H x 26.5"W x 17.75"D (1009.6 x 673.1 x 450.8 mm) |
| Drivers | 18" (457mm) driver |
| Enclosure | ported, front |
| Measurement Source | Data-bass |
| Output SPL at 20 Hz | 98.9 dB |
| Output SPL at 25 Hz | 114.0 dB |
| Output SPL at 31.5 Hz | 118.7 dB |
| Output SPL at 40 Hz | 122.0 dB |
| Output SPL at 50 Hz | 123.7 dB |
| Output SPL at 63 Hz | 129.7 dB |
| Output SPL at 80 Hz | 133.9 dB |
| Output SPL at 100 Hz | 135.1 dB |
| Output SPL at 125 Hz | 135.8 dB |
| Passive | Yes |
| Warranty | 5/3/2 |
| Weight | 138 lbs / 62.6 kg |
- Head-to-Head Comparisons
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Product prices and availability were last checked August 9, 2026 at 6:57 AM UTC and are subject to change; the price and availability shown on Amazon at the time of purchase will apply to the purchase of this product.